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Finding the Fourth Proportional to 638.56, 961.12 and 568

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Solution

The fourth proportional to 638.56, 961.12 and 568 is: 854.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.56 : 961.12 = 568 : x
  2. Step 2: Convert to fraction form
    638.56/961.12 = 568/x
  3. Step 3: Cross multiply
    638.56x = 961.12 × 568
  4. Step 4: Simplify right side
    638.56x = 545,916.16
  5. Step 5: Solve for x
    x = 545,916.16/638.56
  6. Step 6: Final answer
    x = 854.92

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.